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Beneficial Effects of Oral Premarin Estrogen Replacement Therapy Assessed by Human Genome Array

This study has been completed.
Information provided by:
Lawson Health Research Institute Identifier:
First received: April 24, 2006
Last updated: July 8, 2009
Last verified: July 2009
The purpose of this study is to assess the immunological status of patients using Premarin. Premarin use is associated with an enhanced immune status, and possibly even some anti-cancer effect. The researchers will compare the use of Premarin with those not using hormone replacement therapy (HRT) to track the effects of Premarin in reducing the risk of infection and swelling.

Condition Intervention Phase
Estrogen Replacement Therapy
Drug: Premarin
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: Beneficial Effects of Oral Premarin Estrogen Replacement Therapy Assessed by Human Genome Array

Resource links provided by NLM:

Further study details as provided by Lawson Health Research Institute:

Primary Outcome Measures:
  • Human genome array

Secondary Outcome Measures:
  • Denaturing gradient gel electrophoresis

Enrollment: 20
Study Start Date: March 2006
Study Completion Date: February 2007
Primary Completion Date: December 2006 (Final data collection date for primary outcome measure)
Detailed Description:

In recent times, adverse publicity has affected the sales of hormone replacement therapies and the perception of women as to whether or not HRTs should be taken. While a number of brands are available, those from Wyeth are the market leaders. Previous studies by our group have shown an advantage of Premarin, a natural conjugated equine estrogen, in fostering recovery of the Lactobacillus flora in the vagina. These organisms have been shown to help protect the host from urinary and vaginal infections. In the present proposal, we aim to further examine the beneficial effects of Premarin through the use of a human genome array technology.

New microarrays allow measurements to be made of 38,000 or more gene expressions on a single sample. We have recently used an Affymetrix array to examine up and down regulation of vaginal genes from a healthy premenopausal woman before and after administration of a probiotic. Somewhat to our surprise, we noted that over 9,000 genes were expressed and major down regulation occurred in cancer and other genes such as inflammatory cytokines. This was especially interesting as it showed that vaginal treatment could influence genes associated with, for example, the intestine. The array provided data or relevance to estrogen replacement therapy, namely the ability to detect and examine changes in estrogen associated factors.

In short, this system can examine changes to inflammation and host defenses. Based upon the findings of Raz and others (1993), it is likely that Premarin down regulates inflammation, either directly or via an alteration of the vaginal environment resulting in restoration of lactobacilli. Another benefit of the restoration of lactobacilli is that these organisms have anti-cancer properties.

The increased prevalence after menopause of urogenital (bladder and vaginal) infections and complications can be counteracted to some extent by restoration of the normal vaginal microbiota. These infections are extremely common, and treatment with antibiotics and antifungals is compromised by rapid rises in drug resistance (up to 30% for fluoroquinolones in some countries and a doubling of resistance to trimethoprim-sulfamethoxazole). BV has been associated with increased risk of preterm labour (McGregor et al. 1993; Hay et al. 1994; Chaim et al. 1997) and sexually transmitted diseases including HIV, herpes simplex virus, gonorrhea and Chlamydia (Sewankambo et al. 1997; Taha et al. 1998; Olinger et al. 1999; Wiesenfeld et al. 2003; Cherpes et al. 2003). Notably, 35-50% of patients and around 50% of UTI patients suffer a recurrence of infection within 3 months. Post-menopausal women have low levels of lactobacilli and high numbers of pathogens, while 100% of those receiving Premarin are colonized by lactobacilli (Burton et al. 2003; Devillard et al. 2004; Heinemann & Reid, 2005).


Ages Eligible for Study:   35 Years to 95 Years   (Adult, Senior)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Women taking oral Premarin at least for the last month with no urogenital anatomical abnormalities.
  • Women not taking HRT for at least one month with no urogenital anatomical abnormalities (controls).

Exclusion Criteria:

  • Males.
  • Subjects who are not menopausal.
  • Less than 35 years of age.
  • Subjects with recurrent sexually transmitted disease.
  • Subjects with abnormal renal function (serum creatinine >110umol/l, upper limit 90umol/l) or pyelonephritis.
  • Subjects receiving prednisone or immunosuppressive drugs,
  • Subjects who need to be treated for any urogenital infection or with any antimicrobial therapy.
  • Personal history of known or suspected estrogen-dependent neoplasia such as breast or endometrial cancer.
  • Undiagnosed abnormal vaginal bleeding.
  • Active hepatic dysfunction or disease, especially of the obstructive type.
  • Active thrombophlebitis, thrombosis or thromboembolic disorders.
  • Endometrial hyperplasia.
  • Subjects on anticoagulants, antidiabetic and antihypertensive agents
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Please refer to this study by its identifier: NCT00318318

Canada, Ontario
Lawson Health Research Institute
London, Ontario, Canada, N6A 4V2
Sponsors and Collaborators
Lawson Health Research Institute
Principal Investigator: Gregor Reid, PhD, MBA Lawson Health Research Institute and The University of Western Ontario
  More Information


Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Dr. G. Reid, Lawson Health Research Institute Identifier: NCT00318318     History of Changes
Other Study ID Numbers: R-06-710
Study First Received: April 24, 2006
Last Updated: July 8, 2009

Keywords provided by Lawson Health Research Institute:
Gene Expression.
Postmenopausal Women

Additional relevant MeSH terms:
Estrogens, Conjugated (USP)
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs processed this record on April 24, 2017